Any prudent owner would surely do the same thing. As should the testing station...
What I meant about feeling a bit of a bellend is that you would anticipate a respected AM dealership, with a decent workshop facility attached, probably knows more about the issues of LSDs than the average commuter...
Nevertheless. Gathering up your skirts to patronise the sh1t out of them is the only sensible approach...!
I think I paid less than £60 for my MOT. They had to take the car out on the road and put up with my initial neurosis - it took them just under an hour. They arent geting fat on the back of the testing procedure..!